如何返回自定义错误

class UserController extends Controller
{
    public function postSignIn(Request $request)
    {
        $this->validate($request, [
            'name' => 'bail|required|regex:/^\\w+$/',
            'password' => 'required',
        ]);
        $res = User::signIn($request->input('name'), $request->input('password'));
        if ($res > 0) {
            $json = [];
            switch ($res) {
                case 1:
                    $json['name'] = "用户不存在";
                    break;
                case 2:
                    $json['password'] = "密码错误";
                    break;
                case 3:
                    $json['name'] = "该用户已被禁止登陆";
                    break;
                default:
                    $json['name'] = "未知错误$res";
            }
            return response()->json($json, 422);
        }
    }
}

return response()->json($json, 422);这句能有更标准的写法么，我试了下response()没有withErrors方法